function coupon(previous,next,online,print){
  this.previous = previous;
  this.next = next;
  this.online = online;
  this.print = print;
}

bigjoe = new coupon('PEM','halloweentown','http://www.bigjoestore.com/','off');
halloweentown = new coupon('bigjoe','PEM','http://www.halloweentownboston.com/','off');
PEM = new coupon('halloweentown','bigjoe','off','on');